95 research outputs found
Leibniz algebroids, twistings and exceptional generalized geometry
We investigate a class of Leibniz algebroids which are invariant under
diffeomorphisms and symmetries involving collections of closed forms. Under
appropriate assumptions we arrive at a classification which in particular gives
a construction starting from graded Lie algebras. In this case the Leibniz
bracket is a derived bracket and there are higher derived brackets resulting in
an -structure. The algebroids can be twisted by a non-abelian
cohomology class and we prove that the twisting class is described by a
Maurer-Cartan equation. For compact manifolds we construct a Kuranishi moduli
space of this equation which is shown to be affine algebraic. We explain how
these results are related to exceptional generalized geometry.Comment: 58 page
Effective-Lagrangian approach to precision measurements: the anomalous magnetic moment of the muon
We investigate the use of effective Lagrangians to describe the effects on
high-precision observables of physics beyond the Standard Model. Using the
anomalous magnetic moment of the muon as an example, we detail the use of
effective vertices in loop calculations. We then provide estimates of the
sensitivity of new experiments measuring the muon's to the scale of
physics underlying the Standard Model.Comment: 22 pages, 1 figure, PHYZZX & EPSF, report #s UCRHEP-T98, UM_TH-92-17,
and NSF-ITP-92-122I Revision: The paper will now TeX properly; the content is
unchange
Status of the superworld: from theory to experiment
Review to appear in Progress in Particle and Nuclear Physics. Contents:
{1}Introduction}{1} {2}High precision LEP data and convergence of couplings:
physics is not Euclidean geometry}{2} {3}Interconnections between the measured
quantities due to Unification}{7} {4}The origin of and why it should
be abandoned: masses and spectra are needed}{13} {5}The new step forward:
Supergravity}{21} {6}The SU(5) Supergravity Model}{22} {7}SU(5)xU(1)
Supergravity}{32} {8}Detailed calculations for the Tevatron}{47} {9}Detailed
calculations for LEP}{48} {10}Detailed calculations for HERA}{53} {11}Detailed
calculations for Underground Labs and Underwater facilities}{55} {12}Detailed
calculations for indirect experimental detection}{65} {13}The problem of mass
and }{73} {14}Conclusions}{77}Comment: 90 pages, 41 figures (not included), latex. Send requests for hard
copies to "[email protected]". CERN-TH.7136/94, CTP-TAMU-80/9
Limits on Anomalous WWgamma and WWZ Couplings
Limits on the anomalous WWgamma and WWZ couplings are presented from a
simultaneous fit to the data samples of three gauge boson pair final states in
pbar-p collisions at sqrt(s)=1.8 TeV: Wgamma production with the W boson
decaying to enu or munu, W boson pair production with both of the W bosons
decaying to enu or munu, and WW or WZ production with one W boson decaying to
enu and the other W boson or the Z boson decaying to two jets. Assuming
identical WWgamma and WWZ couplings, 95 % C.L. limits on the anomalous
couplings of -0.30<Delta kappa<0.43 (lambda = 0) and -0.20<lambda<0.20 (Delta
kappa = 0) are obtained using a form factor scale Lambda = 2.0 TeV. Limits
found under other assumptions on the relationship between the WWgamma and WWZ
couplings are also presented.Comment: 13 pages, 3 figures, submitted to Physical Review
Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
Extensive experimental data from high-energy nucleus-nucleus collisions were
recorded using the PHENIX detector at the Relativistic Heavy Ion Collider
(RHIC). The comprehensive set of measurements from the first three years of
RHIC operation includes charged particle multiplicities, transverse energy,
yield ratios and spectra of identified hadrons in a wide range of transverse
momenta (p_T), elliptic flow, two-particle correlations, non-statistical
fluctuations, and suppression of particle production at high p_T. The results
are examined with an emphasis on implications for the formation of a new state
of dense matter. We find that the state of matter created at RHIC cannot be
described in terms of ordinary color neutral hadrons.Comment: 510 authors, 127 pages text, 56 figures, 1 tables, LaTeX. Submitted
to Nuclear Physics A as a regular article; v3 has minor changes in response
to referee comments. Plain text data tables for the points plotted in figures
for this and previous PHENIX publications are (or will be) publicly available
at http://www.phenix.bnl.gov/papers.htm
Limits on Anomalous WWgamma and WWZ Couplings from WW/WZ->enujj Production
Limits on anomalous WWgamma and WWZ couplings are presented from a study of
WW/WZ->enujj events in ppbar collisions at sqrt{s}=1.8 TeV. Results from the
analysis of data collected using the D0 detector during the 1993-1995 Tevatron
collider run at Fermilab are combined with those of an earlier study from the
1992-1993 run. A fit to the transverse momentum spectrum of the W boson yields
direct limits on anomalous WWgamma and WWZ couplings. With the assumption that
the WWgamma and WWZ couplings are equal, we obtain -0.34< lambda < 0.36 (with
Delta kappa=0) and -0.43< Delta kappa < 0.59 (with lambda=0) at the 95
confidence level for a form-factor scale Lambda=2.0 TeV.Comment: 37 pages, 13 figures, submitted to Phys. Rev.
Measurement of the and Couplings in Collisions at TeV
We have directly measured the ZZ-gamma and Z-gamma-gamma couplings by
studying p pbar --> l+ l- gamma + X, (l = e, mu) events at the CM energy of
1.813.3 pb^-1)
for the electron (muon) channel, yields the following 95% confidence level
limits on the anomalous CP-conserving ZZ-gamma couplings: -1.9 < h^Z_30 < 1.8
(h^Z_40 = 0), and -0.5 < h^Z_40 < 0.5 (h^Z_30 = 0), for a form-factor scale
Lambda = 500 GeV. Limits for the Z-gamma-gamma$ couplings and CP-violating
couplings are also discussed.Comment: 11 pages, 1 table, and 3 figure
Measurement of the gauge boson couplings in Collisions at TeV
The gauge boson couplings were measured using () events at TeV observed with the
{D\O} detector at the Fermilab Tevatron Collider. The signal, obtained from the
data corresponding to an integrated luminosity of , agrees
well with the Standard Model prediction. A fit to the photon transverse energy
spectrum yields limits at the 95% confidence level on the CP--conserving
anomalous coupling parameters of ( = 0) and
( = 0).Comment: 16pages (14pages + 2figure pages) Uses ReVTEX Two postscript files
for figures will follow immediatel
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